When converting from GDSII/OASIS to Gerber the output file size can often be reduced if we take advantage of Gerber's SR (step and repeat) command. This allows us to define a number of draw commands and then "step" them in a 1D or 2D array.
However one cannot blindly map GDSII arrays or SREFS into SR commands unless one has checked that there is no "interference" from data drawn in the same location from other levels of the hierarchy.
Why Turn it Off?
There is a compute cost to searching and checking the input file repetition. If conversion time becomes an issue using the
When compress is in effect (and by default it is turned on) there are two distinct modes that are possible:
If no mode is specified on the command line then
If your GDSII file has spatially repeating polygons (i.e. identical polygons that are spaced equally) but that repetition is not achieved by SREF or AREF placements, the you can use the